Window ventilator



Ma 10, 1932. E JOHNSON 1,857,911

WINDOW VENTIIILATOR Filed April 6. 1931 2 Sheets-Sheet "1 Eerie-2F. Uohnson M WIM Afiys.

May 10, 1932. F, JOHNSON 1,857,911

WINDOW VENTILATOR Filed April 6, 1931 2 Shets-Sheet 2 Patented May 10, 1932 UNI ED STATES EAR-LE IE. JOHNSON, OF NEW YORK, N. Y.

WINDOW VENTILATOR Application filed April 6, 1931. Serial No. 528,123.

This invention relates to window ventilators and has for one of its objects to provide a novel window ventilator which is so 0011-,

opened. In other words, with my invention the ventilator will operate to provide ven- 1 tilatio n and to filter the air whether the window sash is just slightly open or whether it is open to a point above the ventilator.

In carrying out my invention I provide an open-topped ventilator member which is 0 adapted to be attached to the window frame in usual manner and I also provide a screen or filter in the form of a curtain which closes the open top of the ventilator member and the space between the latter and the window sash in all open positions of the window.

The air-filtering curtain is of some suitable material which will permit air to freely pass therethrough to provide the necessary ventilation but will exclude the passage of dust and dirt thus providing for ventilating the room with pure air.

In order to give an understanding of the invention I have illustrated in the drawings thereof some selected embodiments thereof which will now be described after which the novel features will be pointed out in the claims.

Fig. 1 is a fragmentary perspective view of a window equipped with my improved ventilator;

Fig. 2 is a vertical section through the window and ventilator on an enlarged scale showing the window sash in one position;

Fig. 3 is a similar view showing a window in another position;

Fig. 4 is a view similar to Fig. 2 showing a modified form of the invention;

Fig. 5 is a view similar to Fig. 2 showing still another form of the invention;

Fig. 6 is a section on the line 6--6,- Fig. 2;

Fig. 7 is a section on the line 77, Fig. 2;

Fig. 8 is an enlarged fragmentary sectional view showing details of the construction illustrated in Fig. 4;

In the drawings 1 indicates a window frame having the usualwindow sill 2 and 3 indicates the bottom rail of the lower window sash 4:. v

My improved ventilator comprises an opentopped ventilator member indicated generally at 5 which is supported on the window sill 2 and is suitably attached to the. window frame 1, together with an air-filtering member, which will be presently described, which closes the open top of the ventilator member 5 and the space between the, latterand the lower rail 3 of the window sash 4.

The ventilator member 5 is formed with the front panel 6 and with the ends 7, the latter overlying and being secured to the sides of the window frame in any suitable way as by means of screws 80. The front panel 6 may be in the form of a glasspanel as shown in the drawings,,or may he of metal or wood or have any appropriate construction. This front panel 6 inclines upwardly and outwardly from the window sill as usual in ventilators and the ventilator member is opened at the upper end as shown at 8 for the free admission of airby which the room is ventilated.

As stated above one feature of my invention is an air-filtering-curtain which closes the open upper end 8 of the ventilator member and also the space between the ventilator member and the lower sash 4 in any position of the latter so that all the air which is admitted to the room through the open window and ventilator will be filtered regardless of the extent to which the window is opened. This air-filtering curtain is indi cated at 9 and it is preferably mounted on a spring roller, one end of the curtain being secured to the ventilator member and the other end to the window sash so that as the window is raised and loweredthe curtain will be unrolled and rolled up again.

In the construction shown in Figs. 1, 2 and 3 the spring roller on which the air-filtering H curtain 9 is rolled is located within the ventilator member at the top thereof. This spring roller is indicated at 10 and it is of usual type employed in connection with shades, curtains and the like. Said roller is journalled in the ends 7 of the ventilator member so that the roller can rotate freely. The spring element of the spring roller tends normally to wind the curtain 9 up on the roller as usual in spring rollers. This curtain 9 extends from the roller across the open upper end 8 of the ventilator member 5 and then between two guide members 11 that extend from one end to the other of the ventilator member adjacent the outer edge thereof.

The end of the curtain-9 is secured to the lower rail 3 of the sash t in some suitable way. As herein shown the end of the curtain is clamped to the side face 12 of the lower rail 3 by means of a clamping strip 13 of metal or some suitable material, the latter being secured to the sash by means of screws 14:. The curtain thus extends from the lower rail 3 of the lower sash to the guide members 11 and from the latter to the spring roller 10. This curtain is of the width of thewindow opening and-thus it closes entirely the upper open end of the ventilator member and the space between the ventilator member and the sash.

Because of the spring roller construction the curtain will roll up on the roller and be unrolled therefrom as the window is opened or closed. When the window 'is entirely closed or is in a position where the lower sash rail 3 is below the guides 11 the curtain will extend from the sash up to the guides 1 and from the latter to the spring roller 10. If the window is opened into a position in which the lower rail 3 is above the ventilator member as shown in Figs. 1 and 2 then the curtain extends from the lower rail 3 downwardly to the guide members 11 and thus across the open top of the ventilator member. In all positions of the window, therefore, this curtain member will not only close the open upper end of the ventilator member but also the space between said ventilator member and the window sash.

This curtain member 9 is of some suitable material which will permit the. air to pass therethrough for ventilating the room but will exclude the passage of dust, dirt, rain, snow, etc. Some more or less porous cloth, like cheesecloth, may be used for this purpose or, if desired, a fabric which has been specially treated chemically to give it the desirable air-filtering characteristics.

In order to make a tight joint between the edges of the curtain 9 and the ends 7 of the ventilator member at the top thereof said ends are provided" with laterally-extending flanges 15 which overlie the edges of the curtain. These flanges may be formed by angular-shaped pieces of sheet metal which are attached to the ends 7 of the ventilator member by means of screws 16.

I have also shown similar flanges or wings 10 which are secured to the ends 7 of the ventilator member and which extend vertically from the guides 11 to the bottom of the ventilator.

When the window sash is in the position shown in Fig. 3 with the lower rail 3 below the guides 11 the vertical flanges 40 will con tact with the edges of the vertical portion of the curtain 9 and will thus close any gap which may exist between said edges of the curtain and the ends of the ventilator member 7.

A somewhat similar construction is employed to provide a tight joint between the edges of the curtain 9 and the sides of the window frame when the window sash is raised above the ventilator as shown in Fig. 2. The sides of the window frame have extending therefrom flanges 1'? which extend from the upper edge of the ventilator member upwardly and which are of sufficient extent to overlie the edge of that portion of the curtain which extends upwardly from the guides 11. Th se flanges 17 may also be formed by securing angle-shaped sheet metal strips 18 to the sides of the window frame. The lower end of the flanges 17 will preferably be bent outwardly slightly as shown at 19 so that there will be a rounded surface for the edge of the curtain to pass over as the window is raised and lowered.

I will preferably enclose the spring roller in a suitable housing 20 which is attached to the window ventilator in any suitable way as by means of screws 21. The top 22 of the housing is provided with the slot through which the curtain passes. With this construction the curtain will be entirely sealed within the ventilator member but the curtain will at all times not only close the open top 8 of the ventilator member but also the space etween said top of the ventilator member and the lower rail 3 of the sash regardless of the extent to which the window is opened.

In Fig. 4 I have shown a different embodiment of the invention wherein the spring roller secured to the sash l and moves up and down with the latter while the opposite end of the curtain is secured to the ventilator member. In this embodiment of the inven tion the spring roller 10' is located and journalled in a housing 24:, preferably of sheet metal, which is located at the bottom of the lower rail of the window sash t and, in fact, forms part of said" lower rail. This housing 24 is provided with a slot 25 along one face through which the air-filtering curtain 9 eX- tends, said curtain passing between the guide members 11 and havingits end attached to the upper edge of the front panel 6 of the ventilator member 5.

The connection between the curtain and the panel 6 may be provided in any approved way, but I have herein shown a metal clamping strip 26 which is screwed to the top of the panel member 6 and thus clamps or holds the curtain thereto. In this embodiment of the invention there is provided the guard flanges l5 and 17 at the top edge of the ventilator member and at the sides of the window frame as in the construction shown in Figs. 2 and 3.

The housing 24 will have its lower face 27 at the proper angle to fit the inclined portion 28 of the window sill when the window is closed. This housing may be made in any approved way. As herein shown it is formed of the two sections 29 and 30 which are detaehably connected together by the screws 31 that screw through mating lugs 32 formed on the two parts. The upper section 29 is secured to the bottom of the wooden portion 33 of the window sash by means of screws 34 and the lower section 30 of the housing is provided at one end with the slot 35 to receive the usual flat-sided end 36 of the rod or bar with which the spring rollers of the shade roller type are provided, it being understood that the spring of the spring roll is attached at one end to the bar having the fiat-sided end 36 and at the other end to the spring roller so that as the roller is turned in one direction by the unwinding of the curtain therefrom the spring will be wound up and the wound-up spring will have a constant tendency to rewind the curtain onto the roll.

In Fig. 5 I have shown still a different embodiment of the invention wherein the snring roller 10 is mounted in a housing 37 which is secured on the outside of the front panel 6 of the ventilator member 5. In this embodiment the curtain passes through a slot 38 formed in the housing and over the upper edge 39 of the panel member, the end of said curtain being secured to thelower rail 30f the lower sash 4 by means of the clamping spring 13 as shown in Fig. 2. In this embodiment also there is provided the guides 11 between which the curtain passes and the guard flanges 15 and 17 to make a tight joint between the edges of the curtain and the ends 7 of the ventilator member and sides of the window frame.

In all these embodiments of the invention the air-filtering curtain 9 extends across the open top 8 of the ventilator member 5 and is arranged to close any space existing between the ventilator member and the window sash so that regardless of the extent to whichthe window is open all the air which can enter the room through the open window must pass through. the filtering curtain. Thus only air from which the dust and dirt has been filtered will be admitted to the room.

While for ordinary ventilating purposes it may be sufficient to open the window to a point where the lower sash will be no higher than the top edge of the ventilator member, but in case it is desired to open the window wider, as shown in Figs. 2 and 4, there will still be a filtering screen or curtain closing the full extent of the window opening, and thus ensuring that only pure filtered air will enter the room. 4 v

In the drawings the guides 11 are shown as rods but if desired these may be in the form of rolls which will turn as the curtain is drawn over them thereby reducing friction.

While in order to give an understanding of the invention I have illustrated three different embodiments thereof yet I wish to state that the invention is not limited to the construction shown but may take ,on other forms within the scope of the appended claims.

I claim.

1. The combination with a window frame having a window opening and a window sash" the open-top of the ventilator member and secured to the sash, and a spring roller on which said curtain is wound, whereby not only the opentop of the ventilator member but also the space between said ventilator member and the lower rail of the lower sash will be closed by said curtain in all positions of the lower sash.

3. The combination with a window frame and window sash therefor, of an open-topped ventilator member secured to said window frame, a spring roller secured to the front of the ventilator frame near the top thereof, and an air-filtering curtain wound on said roller and extending across the open. top of the ventilator member, and means to attach the end of said curtain to the lower rail of the window sash.

4. The combination with a window frame and window sash therefor, of an open-topped ventilator member secured. to said window frame, a spring roller secured to the front of the ventilator frame near'the top thereof, and an air-filtering curtain wound on said roller and extending across the open top of the ventilator member,meansto attach the end of 5. The combination with a window frame and Window sash therefor, of an open-topped ventilator member secured to said window frame, guides extending across the top o'fthe ventilator adjacent the path of movement of the window sash, and an air-filtering curtain passing over said guides and connected at one end to said window sash and at the other end to the front of the ventilator member, said curtain closing the open top of the ventilator member and any space between the lower rail of the window sash and the guide members.

6. he combination with a window frame and window sash therefor, of an open-topped ventilator member secured to said window frame, guides extending across the top of the ventilatoradjacent the path of movement of the Window sash, an air-filtering curtain passing over said guides and conneetedjat one end to said window sash and at the other end to the front of the ventilator member, and a spring roller on which the curtain is wound, saldcurtain closing the open top of the ventilator member and any space between the lower rail of the-window sash and the guide members.

7. The combination with a window frame and window sash therefor, of an open-topped ventilator member-secured to the window frame, guiding rods extending across the top of the ventilator member adjacent the path of movement of the window sash, a spring roll secured to the bottom of the window sash, and an air-filtering curtain wound on said roll and extending over said guide rods, the end of said curtain being attached to the ventilator box.

In testimony whereof, I have signed my name to this specification.

EARLE F. JOHNSON. 

